ITU-R BS 597-1-1986 Channel Spacing for Sound Broadcasting in Band 7 (HF) - Section 10A-1 - Amplitude-Modulation Sound Broadcasting in Bands 5 (LF) 6 (MF) and 7 (HF)《波段7(高频)中声音广播的信.pdf

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1、CCIR VOLUME*X-1 90 W 4855212 0503954 2 W 76 Rec. 597-1 RECOMMENDATION 597-1 CHANNEL SPACING FOR SOUND BROADCASTING IN BAND 7 (HF) (Question 44/10, Study Programme 44A/10) The CCIR, / (1982-1986) CONSIDERING (a) (b) frequencies being integral multiples of the channel spacing; (c) multiple of the chan

2、nel spacing; (d) sideband) in the future; (e) band 7 (HF), that the coverage area achieved in practice depends among other things, upon the channel spacing; that there are technical advantages in the adoption of uniform carrier spacing with the nominal carrier that the intermediate frequency (or fre

3、quencies)-of receivers should be chosen so as to be an integral that the choice of channel spacing should also take into account the possible adoption of SSB (single that these advantages can only be fully realised if a uniform value for channel spacing is adopted for UNANIMOUSLY RECOMMENDS 1. that

4、a uniform value of 10 kHz should be used world-wide for channel spacing in band 7 (HF); 2. that the nominal carrier frequencies should be an integral multiple of the channel spacing; 3. may be used for coverage of geographically separated areas; that interleaving channels with carrier frequencies se

5、parated by 5 kHz from those of the main channels 4. multiple of the channel spacing; that, wherever possible, the intermediate frequency (or frequencies) in receivers should be an integral 5. selected for future use in band 7 (HF). that a value of 5 kHz should be used world-wide for channel spacing for any SSB system that may be